Loaf 21.5 × 11.5 cm / 8½ × 4½ in vs Loaf 23 × 13 cm / 9 × 5 in
| Loaf 21.5 × 11.5 cm / 8½ × 4½ in | Loaf 23 × 13 cm / 9 × 5 in | |
|---|---|---|
| Size | 22 × 12 cm | 23 × 13 cm |
| Base area | 247.3 cm² | 299 cm² |
| Usual depth | 7 cm | 7 cm |
| Holds | 1.61 L | 2.09 L |
Can you swap them?
Scale the mixture, or accept a flatter cake. Loaf 23 × 13 cm / 9 × 5 in has 20.9% more area, so a Loaf 21.5 × 11.5 cm / 8½ × 4½ in mixture poured straight in sits 83% as deep. It still bakes, and it browns more at the edges for being shallower. Multiplying by 1.21 restores the depth the recipe was written for.
Scaling the recipe
| Recipe written for | Baked in | Multiply by | Or leave it and get |
|---|---|---|---|
| Loaf 21.5 × 11.5 cm / 8½ × 4½ in | Loaf 23 × 13 cm / 9 × 5 in | 1.21 | 83% of the depth |
| Loaf 23 × 13 cm / 9 × 5 in | Loaf 21.5 × 11.5 cm / 8½ × 4½ in | 0.83 | 121% of the depth |
Multiply every ingredient, including the eggs — round to the nearest half egg and adjust the liquid rather than rounding a whole one up.
Baking time
A mixture 83% as deep is done earlier, not cooler. Leave the temperature alone, start testing at about 83% of the stated time, and let the skewer decide. Why depth sets the time and diameter barely does →
Frequently asked questions
Can I use a Loaf 23 × 13 cm / 9 × 5 in instead of a Loaf 21.5 × 11.5 cm / 8½ × 4½ in?
Yes, with the mixture multiplied by 1.21. Loaf 23 × 13 cm / 9 × 5 in has 299 cm² of base against 247.3 cm², so an unscaled Loaf 21.5 × 11.5 cm / 8½ × 4½ in recipe sits 83% as deep and bakes faster.
What is the difference between a Loaf 21.5 × 11.5 cm / 8½ × 4½ in and a Loaf 23 × 13 cm / 9 × 5 in?
Loaf 21.5 × 11.5 cm / 8½ × 4½ in has a base area of 247.3 cm² and Loaf 23 × 13 cm / 9 × 5 in has 299 cm² — Loaf 23 × 13 cm / 9 × 5 in is 20.9% larger. At their usual depths they hold 1.61 L and 2.09 L.
Do I need to change the baking time between a Loaf 21.5 × 11.5 cm / 8½ × 4½ in and a Loaf 23 × 13 cm / 9 × 5 in?
Yes. Moving a Loaf 21.5 × 11.5 cm / 8½ × 4½ in mixture into Loaf 23 × 13 cm / 9 × 5 in makes it 83% as deep, so start checking at about 83% of the stated time. Depth drives baking time far more than tin diameter does.
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